Just so you know, all those who got VIP3 will get theirs first, then VIP2, then VIP1 so depending on when you registered will be when you get your email. So please be patient.
I've never done an extension so I don't know if this will help you or not so I'm just shooting in the dark here. I just right clicked on the title of that one Extension and clicked on Property and this is what came up. Is that what you are looking for?
Ok, on my Windows 10 machine Build 14372, and in full screen mode on You Tube, no task bar is visible. Just make sure you move your mouse cursor out of the playing area.